JP2009220388A - Method for forming foamed resin molded product and molding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the reduction of dimensional accuracy in a planar shape of foamed resin molded products caused by contraction and retraction to the inside of the molded products of contour shaping end portions of molded product shapes associated with core back. <P>SOLUTION: A cavity for filling shown in Fig.3a is filled with foamable resin 40 beyond a target position A by a predetermined quantity when filling the cavity 33 with the foamable resin 40. Cavities 33 for molding are formed and have second main spaces 33c and second enlarged spaces 33d constituted by enlarging contour forming end portions of a mold product shape to the outside of the contour when carrying out core back. Auxiliary movable molds 34 for forming the contour forming end portions of the molded product 50 move into the second enlarged portions 33d of the cavities 33 for molding as shown in Fig.3c the second main spaces 33c where the resin is not sufficient are filled with the resin when forming the molded product 50 with the foamed resin present in the second enlarged portions 33d. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a molding method and a molding apparatus for a foamed resin molded product, and more particularly, to a method in which a movable mold is core-backed from a fixed mold in the thickness direction of the molded article.

  Conventionally, resin molded products molded by injection molding etc. using ABS (acrylonitrile butadiene styrene) resin or PP (polypropylene) resin as materials, such as instrument panel core, air conditioning duct, bumper beam, door step, quarter panel and air cleaner It is used for automobile parts such as cases. In that case, from the viewpoint of heat insulation, lightness, soundproofing, shock absorption, etc., the resin molded product is used in the resin by using a physical foaming agent such as carbon dioxide or nitrogen or a chemical foaming agent such as sodium hydrogen carbonate. In some cases, the foamed resin molded article has a porous structure in which bubbles are generated.

  As described in Patent Document 1, such a foamed resin molded product has a foamed resin (unfoamed foaming agent) in a molten state in a cavity whose thickness is smaller than that of the molded product having the same contour shape as the molded product. The resin is molded by core-backing the molded product in a direction in which the volume of the cavity increases, more specifically, in a direction in which the thickness of the molded product increases.

  The foamed resin molded product thus molded has a shape when viewed from the core back direction, that is, a so-called contour of the molded product shape (hereinafter referred to as “planar shape” for convenience) while maintaining the cavity shape. The shape when viewed from the direction orthogonal to the direction, the so-called molded product thickness (hereinafter referred to as “side shape” for convenience) is several times larger than before the core back due to the core back of the mold and the foaming of the resin. It has expanded.

Japanese Patent Laid-Open No. 11-156881

  However, in the molding of the foamed resin molded product by the core back of the molding die, it is separated from the outer peripheral edge after molding, the notch edge partially provided outside the molded product, or the outer periphery of the molded product. The contoured end of the molded product shape, such as the peripheral edge of the opening provided in the molded product, contracts inward with the meat of the molded product, and as a result, the overall size in the planar shape of the molded product is the target The problem that the size of the opening and the notch becomes larger than the target size has been found.

  As a result, the dimensional accuracy in the planar shape of the foamed resin molded product is reduced, resulting in a defective shape of the foamed resin molded product, for example, even if trying to fit the mating member using the opening, Even if an attempt is made to fit or position the mating member using the notch, backlash occurs.

  As shown in FIG. 11, in order to elucidate the above-described problem, a detailed study was performed on the case where the foamed resin molded product 50 was molded by core-backing the mold.

  As shown in FIG. 11 (a), in order to form a square-shaped opening 51 of the foamed resin molded product 50, a concave portion 31 a is formed at a predetermined portion of the cavity forming surface of the fixed mold 31, and the movable mold 32. A convex portion 32a is formed at a predetermined portion of the cavity forming surface corresponding to the convex portion 32a, and the convex portion 32a enters the concave portion 31a. In this way, the foamable resin is filled into the cavity 33 formed by the fixed mold 31 and the movable mold 32 in the clamped state.

  Thereafter, as shown in FIG. 11B, the movable mold 32 is core-backed in the direction in which the volume of the cavity 33 increases, more specifically, in the direction in which the thickness of the molded product 50 increases. As a result, the shape when viewed from the core back direction (vertical direction in the example) maintains the cavity shape, and the shape when viewed from the direction orthogonal to the core back direction (front and back direction in the figure), so-called A foamed resin molded product 50 having a thickness several times larger than that before the core back is obtained.

  The molded product 50 has a structure in which a surface layer portion 50a in contact with the cavity forming surfaces of the fixed mold 31 and the movable mold 32 covers a foamed interior 50b in which foamed cells are grown. In particular, in the drawing, the resin portion in contact with the side surface (vertical surface) of the convex portion 32 a of the movable mold 32 forms the end surface of the peripheral portion of the opening 51.

  However, in reality, when the core back is started or during the core back, the surface layer portion 50a of the foamable synthetic resin in contact with the cavity forming surface of the mold is already cooled and the extensibility is lowered. Even when subjected to foaming pressure, it is difficult to expand. As a result, the surface layer portion 50a does not sufficiently follow the cavity 33 whose volume increases with the core back, and the surface area where the pressure receiving area of the foaming pressure from the inside is relatively small, that is, the outer peripheral edge portion constituting the thickness of the molded product The contour forming end of the molded product shape, such as the end surface, the end surface of the notched edge, or the end surface of the peripheral edge of the opening, moves so as to be pulled inward of the molded product when the core is back.

  As a result, a space is generated between the end surface of the peripheral edge of the opening 51 and the side surface of the convex portion 32a of the movable mold 32, and the size of the opening 51 becomes larger than the target size. Even if it tries to assemble the molded product 50 to the mating member by using it, there arises a problem that the size does not match and the product 50 comes off.

  The example shown in FIG. 11 shows a case where the peripheral edge of the opening 51 is degenerated, but the same problem is caused by other edges of the planar shape of the molded product 50, for example, the outer peripheral edge of the molded product 50 or molding. It also occurs at the edge of the notch partially provided in the article 50. As a result, when the outer peripheral edge is degenerated, the size of the molded product 50 in the planar shape is smaller than the target size. In addition, when the cutout edge portion is contracted, the cutout size in the planar shape of the molded product 50 is larger than the target size, like the opening 51.

  An object of the present invention is to cope with the above-mentioned problem that occurs when a foamed resin molded product is molded by core-backing a molding die. It is an object to suppress a decrease in dimensional accuracy in the planar shape of a foamed resin molded product due to degeneration.

  According to a first aspect of the present invention, there is provided a molding method for a foamed resin molded article, wherein a filling cavity is formed between the stationary mold and the stationary mold and has the same shape as the molded article and has a smaller thickness than the molded article shape. It has a movable mold that forms a molding cavity with the fixed mold by core-backing in the thickness direction of the molded product, and fills the filling cavity with a foamable resin, and the movable core back fills the molding cavity. Forming a molded product by foaming a foamable resin with a filling cavity forming step having an enlarged portion that is enlarged to the outside of the contour for a specific portion of the contour-formed end portion of the molded product shape A filling step of filling the filling cavity with a foamable resin, a foaming step of foaming the foamable resin by core-backing the movable mold from the fixed die in the thickness direction of the molded product, It is characterized in that it comprises an auxiliary movable die moving step of moving the auxiliary movable mold at positions corresponding to the enlarged portion of the molding cavity while keeping the foaming state of the foam resin.

  According to a second aspect of the present invention, there is provided a molding method for a foamed resin molded article, wherein the stationary movable mold and the auxiliary movable mold are formed by moving the auxiliary movable mold after the auxiliary movable mold moving step. It is characterized in that the foamable resin is moved and filled in the molding cavity in a state where the foamed resin is maintained in a foamed state.

  The method for molding a foamed resin molded article according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the foamable resin filled in the filling step contains a physical foaming agent.

  According to a fourth aspect of the present invention, the physical foaming agent is a fluid in a supercritical state.

  The molding apparatus for a foamed resin molded product according to claim 5 is configured to form a filling cavity between the fixed die and the fixed die, the same shape as the shape of the molded product and having a thickness smaller than that of the molded product, and from the fixed die. A movable mold that comprises a movable mold that forms a mold cavity between the fixed mold by core-backing in the thickness direction of the molded product, filling the filling cavity with the foamable resin, and a movable mold core A molding apparatus for forming a molded product by foaming a foamable resin in a molding cavity by a back, wherein the molding die forms a cavity for filling and cores back from the fixed die in the thickness direction of the molded product. The molding cavity can be formed and has an auxiliary movable mold that can move to a portion corresponding to the enlarged portion of the molding cavity while maintaining the foamed state of the foamable resin. There.

  According to a sixth aspect of the present invention, there is provided a molding apparatus for a foamed resin molded product, wherein the foamable resin contains a physical foaming agent.

  According to a seventh aspect of the present invention, there is provided a molding apparatus for a foamed resin molded product, wherein the physical foaming agent is a fluid in a supercritical state.

  According to the first aspect of the present invention, there is provided a molding method in which a foaming resin is filled in a filling cavity, and the foaming resin is foamed in the molding cavity by a movable core back to form a molded product. For a specific part of the contoured end of the product shape, a filling cavity forming step having an enlarged portion that is expanded to the outside of the contour, a filling step of filling the filling cavity with a foamable resin, and a movable mold are fixed. Corresponding to the expansion part of the molding cavity while maintaining the foaming state of the foaming resin, and the foaming process of foaming the foamable resin by forming the molding cavity by core back from the mold in the thickness direction of the molded product Since the molding is performed by the auxiliary movable mold moving process of moving the auxiliary movable mold to the site, the flatness of the foamed resin molded product caused by the contraction of the contoured end of the molded product shape accompanying the core back to the inside of the molded product is caused. It is possible to suppress the reduction in the dimensional accuracy of shape. In other words, the specific part of the contoured end of the molded product shape is preliminarily filled with a foamable resin in a filling cavity having an enlarged portion that is enlarged outside the contour, and is expanded outside the contour. After forming the foamed resin to replenish the component, the contour of the shape of the molded product by the auxiliary movable mold is maintained in a state where the foamed state of the foamable resin is maintained, so-called surface layer portion is not completely cured and shape correction is possible. This makes it possible to obtain an overall foamed resin molded product that ensures dimensional accuracy.

  According to the invention of claim 2, the foamable resin is maintained in a state where the foamable resin is maintained in the molding cavity formed by the fixed mold, the movable mold and the auxiliary movable mold by the movement of the auxiliary movable mold. Because of the moving filling, basically the same effect as that of the first aspect can be achieved.

  According to the third and sixth aspects of the invention, since the foamable resin filled in the filling step contains a physical foaming agent, it is possible to obtain a molded product with a high foaming ratio, and due to further remarkable degeneration. A decrease in dimensional accuracy in the planar shape of the foamed resin molded product can be suppressed. Moreover, compared with a chemical foaming agent etc., the foam cell diameter inside a foamed resin molded product can be made into a relatively small diameter, and physical properties, such as rigidity of a foamed resin molded product, can be improved.

  According to the fourth and seventh aspects of the present invention, since the physical foaming agent is a fluid in a supercritical state, it is possible to obtain a molded product having a high expansion ratio, and moreover, a foamed resin molded product resulting from the remarkable degeneration. A decrease in dimensional accuracy in a planar shape can be suppressed. In addition, the foamed cell diameter inside the foamed resin molded product can be made even finer, and physical properties such as rigidity of the foamed resin molded product can be further improved.

  According to the invention of claim 5, a filling cavity is formed between the fixed die and the fixed die, the filling cavity having the same shape as the shape of the molded product and having a smaller thickness than the shape of the molded product, and the thickness of the molded product from the fixed die. A mold that consists of a movable mold that forms a mold cavity with a fixed mold by core-backing in the direction, filling the filling cavity with the foamable resin, and molding with a movable mold core back An apparatus for forming a molded product by foaming a foamable resin in the cavity. The molding die forms a cavity for filling and cores back from the fixed die in the thickness direction of the molded product to form the molding cavity. Since the auxiliary movable mold is movable to the portion corresponding to the enlarged portion of the molding cavity while maintaining the foamed state of the foamable resin, it is basically the same as in the first aspect. Effect It can be achieved.

  Hereinafter, the best mode for carrying out the present invention will be described based on the first embodiment.

  Embodiment 1 of the present invention will be described below with reference to the drawings. In the foamed resin molded product molding apparatus, the members described above are denoted by the same reference numerals.

  FIG. 1 is an overall configuration diagram of a molding apparatus 10 for a foamed resin molded product 50 (see FIG. 2) according to the present invention. FIG. 1a shows a filling process, and FIG. 1b shows a core back process. is there. The molding apparatus 10 includes an injection machine 20 as a filling unit and a molding die 30. The molding operation of the foamed resin molded product 50 performed using the molding apparatus 10 constitutes the molding method of the foamed resin molded product 50 according to the present invention.

  As shown in FIG. 1a, the injection machine 20 injects and fills a molten foamable resin 40 containing a physical foaming agent into a cavity 33 of a mold 30 in a clamped state. A hopper 21 for introducing a base resin such as a resin, and a nozzle 24 (foaming agent) for supplying a supercritical fluid as a physical foaming agent to a molten base resin kneaded in a cylinder Supply means). A fluid in a supercritical state is generated from a cylinder 22 of an inert gas such as carbon dioxide or nitrogen through a supercritical fluid state generator 23. Thereby, the foamable resin 40 of the molten state which made the base resin contain the physical foaming agent is obtained. The foamable resin 40 is injected and filled into the cavity 33 of the mold 30 in a clamped state through a supply passage formed in the fixed mold 31.

  Here, the fluid in a supercritical state is a fluid that exceeds a limit temperature (critical temperature) and pressure (critical pressure) at which gas and liquid can coexist, and the critical temperature is, for example, carbon dioxide The critical pressure is, for example, 7.4 MPa for carbon dioxide and 3.4 MPa for nitrogen. A fluid in a supercritical state has a density close to that of a liquid and has a fluidity similar to that of a gas. As a result, it actively moves in the molten base resin, and diffuses and penetrates even deeply into the resin molecules, which can become seeds or nuclei of fine foaming.

The mold 30 includes a fixed mold 31, a movable mold 32, and an auxiliary movable mold 34 that clamp and open each other. The movable mold 32 is configured to move in order to clamp and open the mold, and can be core-backed in the direction in which the volume of the cavity 33 increases. A hydraulic device 90 for moving the movable mold 32 is installed. Moreover, this movable mold | type 32 is comprised so that the cavity 33 which has the enlarged part expanded to the outer side of the outline about the specific site | part of the outline formation edge part of the foamed resin molded product 50 may be formed.
As shown in FIG. 1b, the foamed cell grows inside due to the core back of the movable mold 32, and an intermediate foamed resin molded product having a porous structure excellent in heat insulation, light weight, soundproofing, shock absorption, etc. is molded. Is done.

  The auxiliary movable mold 34 moves into the cavity 33 when the foamed cell grows inside and forms an intermediate foamed resin molded product by the core back of the movable mold 32 when the surface layer portion is not completely cured. Thus, the shape and dimensions of the intermediate foamed resin molded product are corrected.

  FIG. 2 is a perspective view showing an example of use of the foamed resin molded product 50 molded by the molding apparatus 10. The foamed resin molded product 50 is an automotive part and is a ventilation duct that is assembled to the back surface of the instrument panel that is the mating member 60. The foamed resin molded product 50 has an opening 51 provided in the molded product 50 so as to be separated from the outer periphery 50x. The opening 51 is used to fit and assemble the clip claw 61 of the mating member 60.

  3a to 3c are enlarged cross-sectional views of the main part of the mold according to the first embodiment, in which FIG. 3a is a filling process, FIG. 3b is a foaming process, and FIG. 3c is an auxiliary for supplementing the degenerated portion of the foamable resin. The movable movement process is shown.

  In order to obtain an ideal foamed resin molded product 50 in which a specific portion of the foamed resin molded product 50, for example, the planar shape of the opening 51 has a target size, as shown in FIG. 3a, the cavity 33 for filling is molded. It has an enlarged part in which the contoured end of the product shape is enlarged by a predetermined amount to the outside of the outline. Specifically, the convex portion 32a of the movable mold 32 that forms the opening 51 is set to be smaller in the planar shape than the cavity 33 in FIG. 5a. In the figure, A and A represent contoured end portions (target positions) of the molded product shape, and the first enlarged portion 33b is between the vertical surface of the convex portion 32a and A.

  Thus, the filling cavity 33 in FIG. 3a was formed up to the position (target position A) of the contour forming end of the molded product 50 when the foamed resin molded product 50 after molding was viewed from the core back direction. The first main space 33a and a first enlarged portion 33b extending from the target position to the outside of the molded product 50 by a predetermined amount are continuously formed in the main space 33a.

  Therefore, in the filling process, when the foamable resin 40 is filled into the filling cavity 33 of FIG. 3A, the foamable resin 40 is filled beyond the target position A by a predetermined amount. Here, the predetermined amount by which the first enlarged portion 33b of the filling cavity 33 is extended is such that after the core back, the contour forming end of the intermediate foamed resin molded product is larger than the contour forming end of the molded product 50, and The volume is set within a range that can be replenished with a volume that is insufficient for forming the molded product 50 by degeneration.

  As shown in FIG. 3b, when the core is back, a molding cavity 33 is formed. Similarly to the filling cavity 33, the molding cavity 33 has a second main space 33c and a second enlarged portion 33d in which the contour forming end portion of the molded product shape is expanded to the outside of the contour. The difference between the first main space 33a and the first enlarged portion 33b in the filling process is only that the volume of the core back in the thickness direction is increased.

  In the foaming step, foamed cells grow inside, and an intermediate foamed resin molded product in which the edge of the molded product 50 is degenerated toward the inside of the molded product 50 is formed. As described above, the contour forming end portion of the intermediate foamed resin molded product is larger than the contour forming end portion of the molded product 50. At this stage, the surface layer portion 50a of the intermediate foamed resin molded product is not completely cured.

As shown in FIG. 3 c, the auxiliary movable die 34 that forms the contour forming end of the molded product 50 moves into the second enlarged portion 33 d of the molding cavity 33.
As the auxiliary movable mold 34 moves, the foamed resin present in the second enlarged portion 33d fills the second main space 33c where the resin is insufficient when the molded product 50 is formed. At this stage, since the surface layer portion of the intermediate foamed resin molded product is not completely cured, the destruction of the surface layer portion 50a due to the movement of the auxiliary movable mold 34 or the enlargement of the inside of the foam due to the destruction of the inside of the foam does not occur. .

  4a to 4c are enlarged cross-sectional views of the main part of the mold according to the second embodiment, in which FIG. 4a is a filling process, FIG. 4b is a foaming process, and FIG. 4c is an auxiliary for supplementing the degenerate portion of the foamable resin. The movable movement process is shown. The difference from the first embodiment is that the auxiliary movable die 34 is arranged in the movable die 32 instead of the fixed die 31. The steps up to the foaming step are the same as those in the first embodiment, and the same members are denoted by the same reference numerals.

After the foaming process is completed after the movable mold 32 and the auxiliary movable mold 34 are integrally backed, the auxiliary movable mold 34 that forms the contour forming end of the molded product 50 is molded from the movable mold 32 as shown in FIG. It moves into the second enlarged portion 33d of the cavity 33 for use.
As the auxiliary movable mold 34 moves, the foamed resin present in the second enlarged portion 33d fills the second main space 33c where the resin is insufficient when the molded product 50 is formed.
As a result, the movable members can be concentrated on the movable mold 32, which is advantageous in terms of layout.

  FIGS. 5a to 5c are enlarged cross-sectional views of the main part of the mold according to the third embodiment. FIG. 5a is a filling process, FIG. 5b is a foaming process, and FIG. The movable movement process is shown. The difference from the first embodiment is that the auxiliary movable die 34 is also used as the convex portion 32a. The steps up to the foaming step are the same as those in the first embodiment, and the same members are denoted by the same reference numerals.

  After the foaming process is completed after the movable mold 32 is cored back, the auxiliary movable molds 32b and 32c forming the contour forming end of the molded product 50 are placed in the second enlarged portion 33d of the molding cavity 33 as shown in FIG. Moving. As the auxiliary movable molds 32b and 32c move, the foamed resin present in the second enlarged portion 33d fills the second main space 33c in which the resin is insufficient when the molded product 50 is formed.

Based on FIGS. 6-10, the application example of the molded article which this invention makes object is demonstrated. 6 to 10 are perspective views showing another application example of the foamed resin molded product 50 different from FIG.
6-8 has the notch 52 partially provided in the outer periphery 50x, and it is fitted and positioned in the fitting protrusion 62 of the other member 60 using the notch 52. FIG.
6 shows a case where an auxiliary movable die 34 having a substantially U shape in plan view is used, FIG. 7 shows a case where an auxiliary movable die 34 having a substantially C shape is used, and FIG. 8 shows a case where an auxiliary movable die 34 having a substantially J shape is used. An example of application of a molded product is shown.

  In the case of FIG. 2, it is an endless opening shape with no end in a plan view, but the shape of the auxiliary movable type can be changed according to the present invention even with the notch shape having the end as described above. Thus, it is possible to obtain a foamed resin molded article in which the shape end portion is prevented from being degenerated. Furthermore, it is also possible to secure a moving space for the convex portion provided in the movable mold 32 by using the opening of the notch 52.

FIGS. 9 and 10 are perspective views showing another application example of the structure of the foamed resin molded product 50 itself.
In FIG. 9, the molded product 50 has an opening 51, and a thin portion 53 is formed on the inner bottom surface of the opening 51.
In FIG. 10, the molded product 50 has a notch 52, and a thin portion 53 is formed on the inner bottom surface of the opening 52. Thus, even if it has the thin part 53, it is possible to apply this invention.

Next, a modification in which the above embodiment is partially changed will be described.
1] In Examples 1, 2, and 3, the example using the synthetic resin has been described. However, the type of the resin is not limited to this, and a synthetic resin containing glass fiber can also be used. .

2] In addition, those skilled in the art can implement the present invention in various forms added with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

It is a whole block diagram of the shaping | molding apparatus of the foamed resin molded product of the Example of this invention, Comprising: (a) is a figure which shows a filling process, (b) is a figure which shows a core back process. It is a perspective view which shows the usage example of the foamed resin molded product shape | molded with the said shaping | molding apparatus. It is principal part sectional drawing of the shaping | molding die concerning Example 1 of this invention, Comprising: (a) is a figure which shows a filling process, (b) is a figure which shows a core back process, (c) is an auxiliary | assistant movable mold movement process. FIG. It is principal part sectional drawing of the shaping | molding die concerning Example 2 of this invention, Comprising: (a) is a figure which shows a filling process, (b) is a figure which shows a core back process, (c) is an auxiliary | assistant movable mold movement process. FIG. It is principal part sectional drawing of the shaping | molding die concerning Example 3 of this invention, Comprising: (a) is a figure which shows a filling process, (b) is a figure which shows a core back process, (c) is an auxiliary | assistant movable mold movement process. FIG. It is a figure which shows the molded article which has a U-shaped notch which can apply this invention. It is a figure which shows the molded article which has a C-shaped notch which can apply this invention. It is a figure which shows the molded article which has a J-shaped notch which can apply this invention. It is a figure which shows the molded article which has a thin part in the opening which can apply this invention. It is a figure which shows the molded article which has a thin part in the notch which can apply this invention. It is principal part sectional drawing which shows the shaping | molding operation | movement of a conventional general foamed resin molded product, (a) is a figure which shows a filling process, (b) is a figure which shows an ideal core back process, (c) is actual. It is a figure which shows a core back process.

Explanation of symbols

30 Mold 31 Fixed mold 31a Recess
32 Movable type 32a Convex part
33 Cavity 33a First main space 33b First enlarged portion 33c Second main space 33d Second enlarged portion 34 Auxiliary movable mold 50 Foamed resin molded product

Claims (7)

A fixed mold is formed by forming a filling cavity between the fixed mold and the fixed mold in the same shape as that of the molded product and having a smaller thickness than the molded product shape, and by core-backing from the fixed mold in the thickness direction of the molded product. And a movable mold for forming a molding cavity between them, filling the filling cavity with the foamable resin, and foaming the foamable resin in the molding cavity with the movable core back to obtain a molded product. A method of molding a foamed resin molded product to be molded,
A filling cavity forming step having an enlarged portion expanded to the outside of the contour for a specific portion of the contour forming end portion of the molded product shape,
A filling step of filling the filling cavity with a foamable resin;
A foaming step of foaming a foamable resin by core-backing the movable mold from the fixed mold in the thickness direction of the molded product to form a molding cavity;
An auxiliary movable mold moving step of moving the auxiliary movable mold to a portion corresponding to the enlarged portion of the molding cavity while maintaining the foamed resin in a foamed state;
A method for molding a foamed resin molded product, comprising:   After completion of the auxiliary movable mold moving step, the foamable resin is maintained in a state where the foamable resin is maintained in the molding cavity formed by the fixed mold, the movable mold and the auxiliary movable mold by moving the auxiliary movable mold. The method for molding a foamed resin molded product according to claim 1, wherein:   The method for molding a foamed resin molded article according to claim 1 or 2, wherein the foamable resin filled in the filling step contains a physical foaming agent.   The method for molding a foamed resin molded article according to claim 3, wherein the physical foaming agent is a fluid in a supercritical state. A fixed mold is formed by forming a filling cavity between the fixed mold and the fixed mold in the same shape as that of the molded product and having a smaller thickness than the molded product shape, and by core-backing from the fixed mold in the thickness direction of the molded product. And a mold having a movable mold for forming a molding cavity between them, the foamable resin is filled in the filling cavity, and the foamable resin is foamed in the molding cavity by a movable core back. A molding apparatus for a foamed resin molded product for molding a molded product,
The molding die is capable of forming the filling cavity and core-backing the movable die from the fixed die in the thickness direction of the molded product, thereby forming the molding cavity.
An apparatus for molding a foamed resin molded product, comprising: an auxiliary movable mold that is movable to a portion corresponding to the enlarged portion of the molding cavity while maintaining a foamed state of the foamable resin.   The said foaming resin contains a physical foaming agent, The molding apparatus of the foamed resin molded product of Claim 5 characterized by the above-mentioned.   The apparatus for molding a foamed resin molded product according to claim 6, wherein the physical foaming agent is a fluid in a supercritical state.